I just updated a forum, the problem is solved. The plugins are listed. But have another problem, but will open a separate thread for it.
Unsolved plugin-sanitizehtml not working
I wanted to use the API to post content to nodebb. I've switched on the Allow HTML feature under composer and then I installed plugin-sanitizehtml and restarted. I can't see how I can specify which tags are ok for posted content - plugin-sanitizehtml doesn't seem to offer any options. How can I have HTML allowed but make sure its safe?
@mattdjuk the sanitize HTML plugin is deprecated, the sanitization is built into NodeBB now. By default it should be safe.
@PitaJ that's a good point, the warning in the markdown admin page should probably be less severe now.